// 导出页面为PDF格式
import html2Canvas from 'html2canvas'
import JsPDF from 'jspdf'
// html2Canvas+JsPDF导出页面为PDF格式 , 这种是纯插件方法,没有vue实体dom
export default {
  install(Vue, options) {
    Vue.prototype.getPdf = function () {
      const title = '月报'
      html2Canvas(document.querySelector('#pdfDom'), {
        allowTaint: true,
        // useCORS: true
      }).then(canvas => {
        const contentWidth = canvas.width
        const contentHeight = canvas.height
        const pageHeight = contentWidth / 592.28 * 841.89
        let leftHeight = contentHeight
        let position = 0
        const imgWidth = 595.28
        const imgHeight = 592.28 / contentWidth * contentHeight
        const pageData = canvas.toDataURL('image/jpeg', 1.0)
        console.log('pageData', pageData)
        const PDF = new JsPDF('', 'pt', 'a4')
        if (leftHeight < pageHeight) {
          console.log("<")
          PDF.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight)
        } else {
          console.log(">")
          while (leftHeight > 0) {
            PDF.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight)
            leftHeight -= pageHeight
            position -= 841.89
            if (leftHeight > 0) {
              PDF.addPage()
            }
          }
        }
        PDF.save(`${title}.pdf`)
      })
    }
  }
}
